Drill.



PATENTED DBC. 25, 1906.

H. A. EASTMAN.

DRILL.

APILIOATIOH r1LBD-sEPT.11.19os.

.. wAsmNamN. n. c,

HENRY A. EASTMAN, OF CHICAGO, ILLINOIS.

DRILL.

Specification of Letters Patent.

Patented Dec. 25, 1906.

Application filed September 11, 1905. Serial No. 277.834.

To ctZZ whmn it Hefty concern/ Be it known that I, HENRY A. EASTMAN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Drills, of which the following is a speciiication.

My improvement relates to that class of drills which are used by linemen or other similarly-engaged persons in running their wires through walls. This operation gives considerable trouble, owing to the fact that they frequently have a long distance to go between partitions, and while it is comparatively easy to 'drill the hole it is a great deal of work to get the wire through after the hole has been bored. The devices which have been constructed to overcome this diiliculty with which I am familiar are subject to the following objection: They provide for an opening or orifice in the channel of the said drill or else an orifice in the shank. There the orifice is placed in the channel of the drill, the projecting end of the Wire which it is desired to carry through the opening clogs the feed and makes it very difficult, if not impossible, to bore the hole, and it also wraps around the shank of the drill, as it does where the orifice is in the shank, so that it increases the size thereof and makes it difficult or impossible to get the bit through, besides twisting up and tangling up the wire, so that it causes nearly as much trouble and annoyance as the former method. These difliculties are totally avoided by the use of my improvement, which has for its object to overcome these defects and provide a drill which will carry the wire through the opening with the drill.

My method of attaining the foregoing object may be more readily understood by having reference to the accompanying drawings, which are hereunto annexed and are a part of this specification, in whichh Figure l is a side elevation, showing my improved device. Fig. 2 is an end view of the same. Fig. 3 is a sectionalview, showing the interior construction.

Similar iigures refer to similar parts throughout the entire description.

In the drawings, 1 is a drill-bit which is provided with an annular opening 2 in its center and has at its upper end a reduced stem or neck 3, which has threads 4 out thereon. A piece of tubing 5 of a greater length than the wall to be drilled, whose interior diameter coincides to the size of the threaded stem 3 and whose exterior shall coincide or be slightly smaller in diameter than the drillbit l, is mounted upon the stem 3. Said tubing may be provided with interior threads fitting to and coinciding with the threads 4 cut upon the stem 3, the end 6 of the tubing 5 coming against the shoulder formed by the stem 3 on the drill-bit l, although some other more convenient method may be employed. A similar arrangement is effected at the opp0- site end. A stub 7, being fastened in the chuckS of the brace, (not shown,) is provided with a stem or neck 9, correspondinoin size to the stem 3, said stem being provided with threads 10, which are fitted to and coincide with internal threads cut upon the wall of the tube 5, The stub 7 is provided with an annular opening 11, which extends up a short distance into its interior. I mount in these openings 2 and 11 a steel rod or wire 12, which is of smaller diameter than the said openings and lies loosely therein.

The operation of the device is as follows: The hole having been drilled, the tubing 5 is provided of suil'licent length to extend clear through the wall or partition which is being drilled. The drill-bit 1` is then unscrewed from the tubing 5, and the tubing is also unscrewed from the stub 7. It may be found desirable in practice to mill slots in the threads, so that one-fourth of a turn will permit the withdrawal of the parts, and thus facilitate the operation. This leaves the tubing in the opening which has been drilled and the wire 12 projecting from each end thereof. The wire which is to be run is then fastened to the desired end of the wire 12, which may be provided with an eye 13, as indicated in Fig. 3, when the tubing may be withdrawn from the hole and the wire 12 drawn through, it being obvious that the other wire will follow it.

It is plain that in using this device there is nothing to interfere with the cutting 0f the bit nor any possibility of the wire twisting and causing trouble in that way.

Having described my invention, what I regard as new, and desire to secure by Letters Patent, is- V In a device of the character described, the combination with a cutting-bit having a reduced stem at its upper end, of a tube of greater length than the thickness of the wall to be drilled, said tube having threads cut upon the interior walls of each end thereof,

IIO

said threads tting to and coinciding With tachment to permit the Wire to {be drawn threads out upon the stem of the cutting-bit, through the Wall, for the purpose set 'Lforth lo a stub mounted in the threads cut in the substantially as described.

opposite end ofthe said tube, a rod lying loosely Within said tube, said rod being proy HENRY A EASTMAN vided with an eye to Which the Wire to be Witnesses:

carried through the Wall may be attached, EDWARD P. EAsTMAN,

said bit and stud being capable of quick de- HAROLD J. WHITE. 

